Sherrilene Classen, PhD, MPH, OTR/L, is Professor and Director, School of Occupational Therapy, Elborn College, Room 2555B, 1201 Western Road, Western University, London, Ontario N6G 1H1 Canada. At the time of the study, she was Director, Institute for Mobility, Activity and Participation, and Associate Professor, Department of Occupational Therapy, College of Public Health and Health Professions, University of Florida, Gainesville; sclassen@uwo.ca

Babette Brumback, PhD, is Professor and Program Director, Department of Biostatistics, University of Florida, Gainesville